Improvement in boiler-tubes



NITED STATES PATENT QFFICE.

BENAIAH FITTS, OF NEWARK, NEW JERSEY.

IMPROVEMENT IN BOlLER-TUBES.

Specification forming part of Letters Patent No. 54,318, dated May 1,1866.

To all 'whom it may concern:

Be it known that I, BENAIAH FITTS, of the city of Newark, county ofEssex, and State of New J ersey, have invented a new and usefulImprovement in Circulating-Tubes for Steam- Boilers; and I do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawing, making apart of this specification, in which the figureis a vertical section of a boiler, showing tubes in position asarranged.

The construction is as follows: A is the tirebox; B, the crown-sheet, orthat part directly over the flre 5 (l, the smoke-pipe; D D, space forthe water and steam 5 E the water-line.

F is avertical section of a boiler tube, made tight in the crown-sheetand closed tight at the lower end.

H is a vertical section of a circulating-tube, with peculiarly-formedopenings at the lower end, placed inside of the tube F, reaching fromnear the bottom to alittle above the crownsheet, for the purpose ofkeeping the tube F Well supplied with water, as the rapid generation ofsteam in the tube F drives the water out.

O is a cap placed under the tube H, to prevent the steam formed underand around the end 0f the tube from passing into it.

P P are openings to allow the water to pass out of the tube H, as shownby the arrows.

The tube H and cap O may be connected together, but in such a manner asto leave the openings P P sufficiently large for -the egress ofthewater, they then being placed in position within tube F. The tube Hmay-lean against the side, the cap C resting upon the bottom, orotherwise held in position, care being taken that the parts of contactbetween tubes F and H and cap O should be small, to

prevent the transmission of heat from tube F to the water within tube H;also, that the openings P P should be near the lower end of tube F, soas to supply water to that part which is most exposed to heat.

R is a boiler-tube, in which is a circulatingtube in proper position.

The operation is as follows: When the heat is applied to the outside ofthe tube F, steam being formed inside, no steam is generated inside ofthe circulating-tube H. The steam in the space outside of tube H andinside of tube F rises to the surface, carrying a portion of lthe wateralong with it, thus forming an npward current, the cap O preventing anysteam from entering the tube H, thus allowing the water to pass down thecirculating-tube and out at the openings P P in the direction shown bythe arrows, thereby keeping a constant supply of water in that part ofthe boiler most eX- posed to the heat, and at the same time drawing thewater from that part the least exposed.

l am aware that circulating-tubes in steamboilers are not new. Whatconstitutes the peculiar feature of my invention is arranging cups oversuch tubes, so as to keep a constant supply of water at the parts mostexposed to the heat. l

What I claim as new, and desire to secure by Letters Patent, is-

rlhe cap O over the end of the tube H, leaving openings P P, or othermeans substantially the same, for the purpose of allowing free egressofthe water from within the tube, and at the same time prevent the steamformed under and around the end of the tube from passinginto it, as setforth and described.

BEN AIAB FITTS. Witnesses:

DAVID B. HEDDEN, J. H. GoULD.

